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  <h1>校园学习助手</h1>
  <div style="margin-top: 15px;">
    <a href="index.jsp" style="margin: 0 10px; text-decoration: none; color: #333;">首页</a>丨
    <a href="courses.jsp" style="margin: 0 10px; text-decoration: none; color: #333;">课程</a>丨
    <a href="grades.jsp" style="margin: 0 10px; text-decoration: none; color: #333;">成绩</a>丨
    <a href="help.jsp" style="margin: 0 10px; text-decoration: none; color: #333;">帮助</a>
  </div>
</div>